Garden work

Mulching

Mulch conserves moisture, moderates soil temperature and suppresses weeds. Learn about materials, depth and common mistakes.

What it is

Mulch is a protective layer over the soil in garden beds and around trees. It conserves moisture, moderates soil temperature, reduces weed growth, and, if organic, improves soil as it breaks down. It also gives beds a tidy, finished look. Materials come in two broad families. Organic options include shredded bark, wood chips, pine needles, compost and leaf mold. They decompose and feed the soil, so they need topping up periodically. Inorganic options such as stone or rubber do not break down, but they hold heat, do not improve soil and are harder to remove later. Matching material to plant is helpful: acid-loving shrubs often do well with pine needles or bark, and vegetable beds often do best with straw or compost. The most common mistake is too much mulch, or mulch piled against stems. Many extension services advise a layer of about two to three inches for most beds and warn against mounding mulch against tree trunks, sometimes called volcano mulching. It holds moisture against bark and can encourage rot and pests. Keep mulch pulled back a few inches from trunks and plant crowns. Another mistake is laying mulch over weeds without preparation. Edge the bed, remove existing weeds, and consider a layer of cardboard or a well-installed landscape fabric only where it makes sense. Plastic sheeting under organic mulch can suffocate soil and is rarely a good idea in permanent beds. Ask how the provider calculates quantity. Mulch is sold by the cubic yard, and your quote should say how many yards and what depth.
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What to expect

The crew edges beds, clears debris and weeds, spreads mulch to a consistent depth, keeps it away from trunks and stems, and cleans paved surfaces. Delivery of bulk mulch is usually included in the price or listed separately.

Typical season

Spring after soil warms is typical; fall mulching helps protect roots in colder zones. Many gardeners refresh once a year.

Do it yourself or hire?

Mulching is easy DIY work if you are comfortable moving material. Hire for large areas, delivery logistics or when you want crisp bed edging.

Questions to ask

What type of mulch do you recommend for my plants, and why? What depth will you apply? Is edging, weeding and delivery included in the quote? How will you keep mulch away from trunks? Where does the mulch come from, and is it free of weed seed?

Questions and answers

How deep should mulch be?

Many extension services suggest about two to three inches for most garden beds, kept clear of stems and trunks.

Do I need to remove old mulch?

Usually not, unless it has compacted into a mat or become too deep. Loosen it and top up as needed.

Is colored mulch safe?

Many dyed mulches are fine, but ask about the source and what the colorant is made from.

When should I mulch?

Spring is common, and fall mulching helps insulate roots in colder regions.

Find a business

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